The function of a CSD in an AC generating system is to ?
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Because of the input/output relationship of an AND gate it is often referred to as the ?
The function of a NOT logic gate within a circuit is to ?
When two dc generators are operating in parallel control of load sharing achieved An equalising circuit which, in conjunction with voltage regulators, varies field excitation current of generators, an equalising circuit which, in turn, controls speed of generators, carrying out systematic load shedding procedures, synchronous bus bar. 
A condenser in parallel with breaker points will Intensify current in secondary winding, assist in collapse of secondary winding, permit arcing across points, assist in negative feedback to secondary coil. This question about ignition on a piston engine, the use of a magneto. the components of a typical magneto consist of a permanent magnet. a primary a secondary windings on a core. a way of making magnet or core move (by rotating either one). contact breaker points. a condenser (capacitor). a distributor. inside primary circuit a set of conctact points that make flux reversals more abrupt when they open close at critical moments. the condenser (capacitor) mainly there to absorb sparks reduce arcing, to stop points getting pitted worn. it connected across contact points so it shorted out when they close, but instant they open, it absorbs current from collapsing current in primary coil (i.e. it charged) so points open cleanly, with very few sparks. this know as a spark quench. the current from capacitor when it discharges also hastens collapse of primary field (by opposing it), to increase induced voltage. the more sudden breaking of primary circuit is, more current will be induced in secondary coil. 
A unit that converts electrical dc into ac An inverter, an ac generator, a transformer rectifier unit, a thermistor. Dc to ac inverter. ac to dc rectifier. 
On board electrical systems are protected against faults of following type 1 ac generator over voltage2 ac generator under voltage3 over current4 csd or generator over speed5 under frequency6 undue vibration of ac generatorsthe combination of correct statements , 2, 3, 4, 5,, 2, 4, 6,, 3, 5, 6, 2, 3, 4, 5, 6. The on board electrical systems are protected all of these scenarios except vibration of generator. Question Electrics 26 Answer 8
The purpose of a battery control unit generally to isolate battery 1 from bus when battery charge has been completed2 when there a battery overheat condition3 in case of an internal short circuit4 in case of a fault on ground power unitthe combination which regroups all of correct statements Question Electrics 26 Answer 9
The resistors r1 and r2 are connected in parallel the value of equivalent resistance req so obtained given the following formula /req =/r+/r2, req = rx r2,/req =/(r+ r2), req = r+ r2 Question Electrics 26 Answer 10
The function of generator breaker to close when voltage of Generator greater than battery voltage to open when opposite true, alternator greater than battery voltage to open when opposite true, battery greater than generator voltage to open when opposite true, battery greater than alternator voltage to open when opposite true. The generator breaker controlled sensors that detect over/under speed (over/under frequency), reverse or over current plus control bringing generator on or offline. the function of generator breaker to close when voltage of generator greater than battery voltage to open when opposite true. Question Electrics 26 Answer 11
The input and output of a static inverter are respectively Dc ac, ac ac, dc dc, ac dc. Question Electrics 26 Answer 12
Alternating current can be derived from direct current An inverter, a series wound motor, an alternating current motor, use of relays. Question Electrics 26 Answer 13
The rating of electrical fuses expressed in Amperes, volts, watts, ohms. Question Electrics 26 Answer 14
A 'zener' diode used Voltage stabilisation, rectification, reverse current protection, digital displays. A zener diode a special kind of diode which allows current to flow in forward direction in same manner as an ideal diode, but will also permit it to flow in reverse direction when voltage above a certain value, but keeps it constant. the zener diode used voltage stabilisation. Question Electrics 26 Answer 15
The type of gate which requires all conditions with logic 1 engagement A logic gate an elementary building block of a digital circuit. most logic gates have two inputs one output. at any given moment, every terminal in one of two binary conditions low (0) or high (1), represented different voltage levels. the logic state of a terminal can, generally does, change often, as circuit processes data. there are seven basic logic gates and, or, xor, not, nand, nor, xnor. the and gate so named because, if 0 called 'false' 1 called 'true', gate acts in same way as logical 'an operator. the following illustration table show circuit symbol logic combinations an and gate. (in symbol, input terminals are at left the output terminal at right.) the output 'true' when both inputs are 'true'. otherwise, output 'false'. Question Electrics 26 Answer 16
To reverse direction of rotation of a shunt type parallel field dc electric motor it necessary to Reverse polarity of either stator or rotor, reverse polarity of motor connections, change connections from shunt to series, connect a phase shift capacitor to field circuit. Changing polarity of current would change direction of field around conductor whilst leaving polarity of main field unchanged. Question Electrics 26 Answer 17
The power required field excitation of main rotor in modern constant frequency alternators directly controlled The voltage regulator, an excitation alternator with a permanent magnet generator, a battery, an ac generator. When a brushless generator's rotor initially driven the csd unit, a permanent magnet generator induces an ac voltage into pilot output. the ac voltage then full wave rectified fed to main exciter way of voltage regulator. the three phase winding on rotor now has a voltage induced in it, which fed to dc main field way of a three phase rectifier network. the dc main field rotates induces a voltage in ac output windings, which, at same time, increases output of pilot exciter. this sequence of events continues until generator reaches its regulated output voltage. the output typically 200/115 volts three phase 400 hz. Question Electrics 26 Answer 18
The ignition system generally used small aircrafts a High tension system, battery ignition system, high intensity system, low tension system. the sole purpose of ignition system to supply a high energy spark at right moment thereby igniting fuel air mixture so that engine can start its power stroke. the source the spark comes from magnetos. in magneto, magnetic field generates a voltage in coil which transformed to a higher voltage a secondary coil with much more windings than primary coil. a breaker contact in primary coil circuit interrupts flowing current this interruption causes magnetic field to collapse thereby generating a very high peak voltage in secondary coil. this peak voltage then conducted to correct spark plugs the distributor high voltage leads. Question Electrics 26 Answer 19
Because of connection in parallel of electrical equipments on an ac bus bar isolation of individual equipments Decreases bus bar current consumption, increases bus bar voltage, decreases bus bar voltage, increases bus bar current consumption. In parallel, ac current shared between different electrical equipments connected on bus bar. if you disconnect one of them, bus bar current consumption will be reduced. Question Electrics 26 Answer 20
Regarding 1 a fuse and 2 a circuit breaker ( ) not resettable, (2) resettable, ( ) resettable, (2) not resettable, ( ) not suitable high currents, (2) suitable high currents, ( ) suitable high currents, (2) not suitable high currents. Question Electrics 26 Answer 21
Regarding ohm's law The current in a circuit directly proportional to voltage, the current in a circuit directly proportional to resistance of circuit, the power in circuit inversely proportional to square of current, the current in a circuit inversely proportional to voltage. Question Electrics 26 Answer 22
When ac generators are connected in parallel reactive loads are balanced means of Excitation current, frequency or load controller, voltage controller, torque of constant speed drive (csd). If generators are to be paralleled frequency adjusted adjusting csd output torque to balance real load the reactive loads are trimmed adjusting excitation current from voltage regulator. Question Electrics 26 Answer 23
Generators when connected to same bus bar are usually connected In parallel mode, in series mode, dependent on type of generator, dependent on type of engine. Question Electrics 26 Answer 24
The advantages of nickel cadmium compared with lead acid batteries are 1 lower risk of thermal runaway2 higher internal resistance hence higher power3 reduced charging time4 constant output voltagethe combination which regroups all correct statements Question Electrics 26 Answer 25
Static dischargers 1 are used to set all parts of airframe to same electrical potential 2 are placed on wing and tail tips to facilitate electrical discharge 3 are used to reset electrostatic potential of aircraft to a value approximating 0 volts 4 are located on wing and tail tips to reduce intererence with on board radiocommunication systems to a minimum 5 limit risks of transfer of electrical charges between aircraft and electrified clouds the combination regrouping all correct statements 2, 4, 5,, 2, 5,, 3, 4, 3, 4, 5. We are not looking to set all parts of airframe to same electrical potential, we are looking to maintain electrical airframe potential at around 10000 volts via static dischargers (by providing a path the electrons). example of static dischargers on a wing without static dischargers, electrical airframe potential would rise up to a value 10 times higher would disturb and/or damage onboard equipment. Question Electrics 26 Answer 26
Assuming initiating cause removed which of these statements about resetting are correct or incorrect i a fuse resettable ii a circuit breaker resettable I incorrect, ii correct, i incorrect, ii incorrect, i correct, ii incorrect, i correct, ii correct. Question Electrics 26 Answer 27
Assuming initiating cause removed which of these statements about resetting are correct or incorrect i a fuse not resettable ii a circuit breaker resettable I correct, ii correct, i incorrect, ii correct, i correct, ii incorrect, i incorrect, ii incorrect. Question Electrics 26 Answer 28
The diagram shown in annex represents a twin engine aeroplane electrical system batteries are located at positions 877 each generator has its own busbar with non essential services connected to it, or those that don't matter if it fails. both are ultimately connected in parallel to a central (combining) busbar which carries essential services. batteries are located on hot bus 1 hot bus 2, providing a source of power if both generators fail. Question Electrics 26 Answer 29
Electrical work measurement unit in international system of units si Joule, watt, ohm, ampere. unit of force the unit of force in mks (metre, kilogram, second) system the force which gives to a mass of 1 kilogram an acceleration of 1 metre per second, per second. joule (unit of energy or work) the joule the work done when point of application of 1 mks unit of force newton moves a distance of 1 metre in direction of force. watt (unit of power) the watt the power which in one second gives rise to energy of 1 joule. ampere (unit of electric current) the ampere that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross section, placed 1 metre apart in vacuum, would produce between these conductors a force equal to 2 x 10&8722 7 mks unit of force newton per metre of length. ohm (unit of electric resistance) the ohm the electric resistance between two points of a conductor when a constant potential difference of 1 volt, applied to these points, produces in conductor a current of 1 ampere, conductor not being seat of any electromotive force. Question Electrics 26 Answer 30
If two constant frequency ac generators are operating independently then phase relation between both generators Is unimportant, must be synchronised, must be2 ° out of phase, must be 24 ° out of phase. Question Electrics 26 Answer 31
The logic symbol shown represents assuming positive logic 880 An invert or not gate, a nand gate, a nor gate, an exclusive gate. A logic gate an elementary building block of a digital circuit. most logic gates have two inputs one output. at any given moment, every terminal in one of two binary conditions low (0) or high (1), represented different voltage levels. the logic state of a terminal can, generally does, change often, as circuit processes data. there are seven basic logic gates and, or, xor, not, nand, nor, xnor. a logical inverter , sometimes called a not gate to differentiate it from other types of electronic inverter devices, has only one input. it reverses logic state. Question Electrics 26 Answer 32
The connection in parallel of two 12 volt/40 amp hours batteries will create a unit with following characteristics 2 volt/ 8amp hours, 24 volt/ 4amp hours, 24 volt/ 8amp hours,2 volt/ 4amp hours Battery packs achieve desired operating voltage connecting several cells in series, with each cell adding to total terminal voltage 24 volt / 40 amp hours. parallel connection attains higher capacity increased current handling, as each cell adds to total current handling 12 volt/ 80 amp hours. in parallel we increase flow, in series we increase tension. Question Electrics 26 Answer 33
The capacity of a battery the Amount of ampere hours that a fully charged battery can supply, number of cycles (charging discharging) that a battery can withstand without deterioration of its cells, no load voltage of battery multiplied its rated output current, intensity withstood the battery during charging. Question Electrics 26 Answer 34
The frequency of current provided an alternator depends on Its rotation speed, its phase balance, its load, strength of excitation current. Question Electrics 26 Answer 35
Direct current generators are connected In parallel to provide maximum power, in parallel to provide maximum voltage, in series to provide maximum voltage, in series to provide maximum power. Generators run most efficiently when loaded to their rated capacity. therefore, when load demand increases, one or more generators can be connected in parallel to provide more power. this the only way to reach maximum power with dc generators. Question Electrics 26 Answer 36
When carrying out a battery condition check using aircraft's voltmeter A load should be applied to battery in order to give a better indication of condition, no load should be applied to battery because it would reduce voltage, battery should be isolated, load condition unimportant. Question Electrics 26 Answer 37
When a battery almost fully discharged there a tendency the Voltage to decrease under load, voltage to increase due to current available, current produced to increase due to reduced voltage, electrolyte to 'boi. Question Electrics 26 Answer 38
To ensure correct load sharing between ac generators operating in parallel Both real reactive loads must be matched, matching of loads unimportant, only reactive loads need to be matched, only real loads need to be matched. Question Electrics 26 Answer 39
The frequency of an ac generator dependent on Number of pairs of poles the speed of moving part, number of individual poles only, field strength the speed of moving part, number of individual poles the field strength. The frequency of induced ac current depends on revolution of rotor. since rate of revolution revolutions per minute (rpm) frequency expressed as cycles per second, frequency of induced ac current will be rate of revolution of rotor divided 60. in addition to above, if two magnets are used (two pole pairs) frequency doubled (tripled three). thus putting all of this in a formula we get frequency (hz) = rpm x number of pole pairs / 60. Question Electrics 26 Answer 40
If a current passed through a conductor which positioned in a magnetic field A force will be exerted on conductor, intensity of magnetic field will decrease, current will increase, there will be no effect unless conductor moved. When a current passed through wire wrapped around a conductor, its magnetic field penetrates conductor, causes domains to turn, aligning parallel to magnetic field, so their tiny magnetic fields add to wire's field, creating a large magnetic field that extends into space around magnet. the larger current passed through wire coil, more domains align, the stronger magnetic field is.
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